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FRANK A. BURNHAM, OF BATTLE CREEK, MICHIGAN, ASSIGNOR OF ONE-HALF TODORR B. BURNHAM, OF SAME PLACE.

DIRECT-ACTING STEAM-PUMP.

SPECIFICATION forming part of Letters Patent No. 519,857, datedMay 15,189 4.

Application filed February ll, 1893. Serial No. 461,886. (No model.)

.To @ZZ whom it may conceive:

Be it known that I, FRANK A. BUnNHA-M, a citizen of the United States,residing at Battle Creek, in the county of Calhoun and State ofMlchigan, have invented certain new and useful Improvements inDirect-Acting SteamrPumps, of which the following is a specication,reference being had therein to the accompanying drawings.

rI his invention relates more particularly to an improvement in valvegear of direct acting steam pumps, and consists in the improvedconstruction and arrangement of valves in connection with ports andpassages by means of which the induction and exhaust of the steam areeffected, all as hereinafter described With reference to theaccompanying drawings, in which- Figure 1 is a vertical longitudinalsection through a direct acting steam pump of my improved construction.Fig. 2 isa cross section thereof on line m- Fig. l. Fig. 3 is ahorizontal section on line fy-y in Fig. l. Fig. 4 is a plan of the topof the cylinder with the valve chest removed. Fig. 5 isacross-section online ,e--s in Fig. 3.

A represents the main steam cylinder provlded With the usual steam portsd a and main exhaust port b.

B represents the piston provided with the usual metallic packing rings Band With annular grooves c c Which form exhaust passages near each endof said piston.

D represents the valve chest secured by bolts to the main cylinder andcontaining a supplemental piston which carries the main valve F. Thesupplemental piston is formed with heads E E at opposite ends which movein steam chambers H H2 formed in the valve chest and have steam ports dd drilled through them. The stem E2 connecting these tWo heads togetheris provided with collars or projections c between which the main valveis held and guided in its movement.

G is the induction pipe through which the live steam is admitted intothe steam space H of the valve chest. The steam chambers H H2 of thevalve chest have supplementary exhaust passages ff connecting the endsof said steam chambers with the main cylinder at points near its center,so located that in the operation of the main piston B, the annulargrooves c c therein alternately coincide with such passages just beforeand during the completion of each stroke of the piston. The valve chestis provided at one side of the main valve with an enlargement D whichincloses an exhaust deiiecting valve I controlling three ports g h andt' in the valve seat. This valve is a slide valve provided at the underside with the usual exhaust cavity adapted to coincide with the ports gh t in such manner as to connect the ports g and 7L or the ports zandrf. The port g communicates through a passage g' with the exhaust pipesJ, the central port 7L communicates through a passage z with the mainexhaust port b and with an exhaust port b leading directly into thecylinder,and the port 'L' communicates through a passage 'el' with thesuction chamber K of the steam pump, and in this passage there islocated a check valve L.

The exhaust defiecting valve is to be operated by hand preferably bymeans of a rock shaft M journaled in suitable vertical bearings formedin the valve chest above the detlectin g valve. This rock-shaft passesthrough a stufting box N to the outside Where it is provided with ahandle O and at its lower end it is provided with a lateral arm P whichprojects between tWo guide flanges Q formed on top of the deflectingvalve. It is obvious that a straight stem passing through the end of thechest may be used in place of the rock shaft for operating the valve.

In practice the parts being arranged and constructed substantially asshown and described, they are intended to operate as follows: In theposition shown in Fig. l, the main piston has just completed its traveltoward the left and in this position the annular groove c in the mainpiston now coincides with the passage f and the steam contained in thesteam chamber H2 is exhausted more freely by Way of the passage fannular' groove c', and port b into the main exhaust port b; then it canflow into the chamber from the valve chest through the small passageCZ'. The valve controlling or supplementary piston be ing now exposed tothe full pressure or stress of steam onlyagainst the head Eis forced tothe right and carries the main valve F with it, thus ICO opening thepassagectto the induction of steam and connecting the passage a to theexhaust. The exhaust passage f is closed by the head E E and the pistonbecomes balanced again. The movement of the main piston then takes placetoward the right aud when it is near the end of its travel the annulargroove cwill now be brought into coincidence with the opening ot' thepassage finto the cylinder. This permits the steam from the steamchamber H to exhaust and therefore the valve controlling piston will beforced to the left and carry the main valve back again and reverse themovementof the main piston. The movement of the main valve is thusaccomplished by exhausting live steam alternately from the steamchambers in which the opposite heads of the valve controlling pistonmove. The ports d d may be made very small as it requires but littlesteam to move the valve controlling piston and it is obvious that ifthev piston heads E E are made loose fitting the leakage of steam pastthese heads into the valve chambers H H2 will accomplish the objects ofthe ports d d and the latter may then be entirely omitted and it is thevery advantage of this valve construction that the piston E E need notbe tight. By turning the handle O of the detlecting valve into theposition shown in Fig. 3 the exhaust valve is in such position that itdeliects the exhaust steam from the cylinder through the cavity of saidvalve into the passage t" which conducts it into the suction chamber ofthe pump Where it is condensed and heats the Water which makes the pumpespecially adapted for boiler feeding purposes. By turning the handle Ointo the position shown in dotted lines, the exhaust steam from thecylinder is conducted into the exhaust pipe J.

A salient feature of my construction is that the deflecting valve isalways held to its seat with lthe full pressure of the live steam in thechest. This overcomes the great objection against the use of adeiiecting valve, namely, that in case the valve is not absolutelytight, air will leak in through the open exhaust pipe under the valveinto the passage t" and destroy the suction of the pump.

My construction has also the advantage of great simplicity andcompactness, the main valve and deecting valve are arranged side by sideinclosed in a common steam chest and moving on a common valve seat, sothere is but one seat to face off and by removing four bolts every partof the Whole valve mechanism can be examined.

What I claim as my invention is- 1. In a steam pump, the combinationwith the steam cylinder and valve chest containing the main steam valve,ot an exhaust deflecting valve provided with an exhaust cavity and portsand passages adapted tobe connected alternatively through said exhaustcavity to exhaust the steam from the cylinder into the exhaust pipe orinto the suction chamberof the pump, said exhaust deflecting valve beinginclosed in a valve chest and under live steam pressure, substantiallyas described.

2. In a steam pump, the combination With the steam cylinder'and valvechest containing a main slide valve, of an exhaust deflecting valveinclosed in a chamber contiguous to said main valve chest, exhaust portsand passages controlled by said deflecting valve, Wherebythe exhauststeam from the cylinder maybe alternatively dellected into the suctionof the pump, and a rock shaft journaled in the valve chest on top ofsaid deliecting valve and adapted to move said valve into itsalternative position, substantially as described.

3. In a stea'm pump, the combination With the steam cylinder havingsteam ports leading into the ends of the cylinder and a central mainexhaust port, of a main slide valve controlling said port, the exhaustport h communicating With the main exhaust port of the cylinder, theexhaust ports g and t' communicating respectively into the exhaust pipeand into the suction 'chamber of the pump, the exhaust deflectingvalveprovided with an exhaust cavity adapted to alternately connect theexhaust port h with the exhaust ports g and t' and the rock shaft Mjournaled in the valve chest and provided with means for operating theexhaust deflecting valve, all combined and arranged to operate,substantially as described.

1. In a steam pump, the combination With the steam cylinder, a valvechest containing a valve moving piston provided with the heads engagingin steam chambers in the opposite ends of said valve chest and carryingthe main slide valve centrally of said piston, an exhaust deiiectingvalve located alongside said main slide Valve in the lateral enlargementformed in said valve chest, and exhaust ports and passages controlled bysaid deflecting valve, substantially as described.

ln testimony whereof I affix my signature in presence of two witnesses.

FRANK A. BURNHAM. Vitnesses:

M. B. ODOGHERTY, N. L. LINDOP.

l'OO

